/***************************************************************************/
/*                                                                         */
/*  ftsynth.c                                                              */
/*                                                                         */
/*    FreeType synthesizing code for emboldening and slanting (body).      */
/*                                                                         */
/*  Copyright 2000-2006, 2010, 2012 by                                     */
/*  David Turner, Robert Wilhelm, and Werner Lemberg.                      */
/*                                                                         */
/*  This file is part of the FreeType project, and may only be used,       */
/*  modified, and distributed under the terms of the FreeType project      */
/*  license, LICENSE.TXT.  By continuing to use, modify, or distribute     */
/*  this file you indicate that you have read the license and              */
/*  understand and accept it fully.                                        */
/*                                                                         */
/***************************************************************************/


#include <ft2build.h>
#include FT_SYNTHESIS_H
#include FT_INTERNAL_DEBUG_H
#include FT_INTERNAL_OBJECTS_H
#include FT_OUTLINE_H
#include FT_BITMAP_H


/*************************************************************************/
/*                                                                       */
/* The macro FT_COMPONENT is used in trace mode.  It is an implicit      */
/* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log  */
/* messages during execution.                                            */
/*                                                                       */
#undef  FT_COMPONENT
#define FT_COMPONENT  trace_synth


/*************************************************************************/
/*************************************************************************/
/****                                                                 ****/
/****   EXPERIMENTAL OBLIQUING SUPPORT                                ****/
/****                                                                 ****/
/*************************************************************************/
/*************************************************************************/

/* documentation is in ftsynth.h */

FT_EXPORT_DEF( void )

FT_GlyphSlot_Oblique( FT_GlyphSlot

slot )
{
FT_Matrix transform;

FT_Outline *outline = &slot->outline;


/* only oblique outline glyphs */
if ( slot->format != FT_GLYPH_FORMAT_OUTLINE )
return;

/* we don't touch the advance width */

/* For italic, simply apply a shear transform, with an angle */
/* of about 12 degrees.                                      */

transform.

xx = 0x10000L;

transform.

yx = 0x00000L;

transform.

xy = 0x06000L;

transform.

yy = 0x10000L;

FT_Outline_Transform( outline,

&transform );
}


/*************************************************************************/
/*************************************************************************/
/****                                                                 ****/
/****   EXPERIMENTAL EMBOLDENING SUPPORT                              ****/
/****                                                                 ****/
/*************************************************************************/
/*************************************************************************/


/* documentation is in ftsynth.h */

FT_EXPORT_DEF( void )

FT_GlyphSlot_Embolden( FT_GlyphSlot

slot )
{
FT_Library library = slot->library;

FT_Face face = slot->face;

FT_Error error;

FT_Pos xstr, ystr;


if ( slot->format != FT_GLYPH_FORMAT_OUTLINE &&
slot->format != FT_GLYPH_FORMAT_BITMAP  )
return;

/* some reasonable strength */
xstr = FT_MulFix( face->units_per_EM,
                  face->size->metrics.y_scale ) / 24;

ystr = xstr;

if ( slot->format == FT_GLYPH_FORMAT_OUTLINE )
{
/* ignore error */
(void)FT_Outline_EmboldenXY( &slot->outline, xstr, ystr );
}
else /* slot->format == FT_GLYPH_FORMAT_BITMAP */
{
/* round to full pixels */
xstr &= ~63;
if ( xstr == 0 )

xstr = 1 << 6;

ystr &= ~63;

/*
 * XXX: overflow check for 16-bit system, for compatibility
 *      with FT_GlyphSlot_Embolden() since freetype-2.1.10.
 *      unfortunately, this function return no informations
 *      about the cause of error.
 */
if (( ystr >> 6 ) > FT_INT_MAX || ( ystr >> 6 ) < FT_INT_MIN )
{
FT_TRACE1(( "FT_GlyphSlot_Embolden:" ));
FT_TRACE1(( "too strong embolding parameter ystr=%d\n", ystr ));
return;
}

error = FT_GlyphSlot_Own_Bitmap( slot );

if ( error )
return;

error = FT_Bitmap_Embolden( library, &slot->bitmap, xstr, ystr );

if ( error )
return;
}

if ( slot->advance.x )
slot->advance.x +=

xstr;

if ( slot->advance.y )
slot->advance.y +=

ystr;

slot->metrics.width       +=

xstr;

slot->metrics.height      +=

ystr;

slot->metrics.horiAdvance +=

xstr;

slot->metrics.vertAdvance +=

ystr;

/* XXX: 16-bit overflow case must be excluded before here */
if ( slot->format == FT_GLYPH_FORMAT_BITMAP )
slot->bitmap_top += (FT_Int)( ystr >> 6 );
}


/* END */
